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General synthetic approach: a) C2F5I, MeLi‐LiBr, −70 °C then 0 °C; b) phenyl Grignard, cat. CuCl, THF, 0 °C; for compound 24 l: iso‐propylmagnesium chloride, nBuLi, 3‐(4‐bromophenyl)‐3‐methyloxetane, cat. CuCl, THF, 0 °C; c) acidic cleavage.
